Sams Teach Yourself SQL in 21 Days, Fourth Edition

Summary

Today covers some of the history and structure behind SQL. Because SQL and relational databases are so closely linked, today also covers (albeit briefly) the history and function of relational databases. As you learned, databases are used by most organizations in one form or another to manage important corporate data. Without databases, organizations would be forced to continue storing all data in hard-copy format. Without a standard database language such as SQL, users would lack the robust and easy-to-use interface that allows communication with the database environment. Also, remember Dr. Codd's rules of the relational database model as it is the basis for all relational database management systems (RDBMSs). Tomorrow is devoted to ...